In a private beach cove, the busty coed stepsister, her silicone tits straining against her bikini top, is caught off guard by her stepbrother's massive erection. He corners her, his thick cock throbbing with desire. She plays innocent, but her eyes betray her curiosity. He spins her around, pushing her against a rock, and lifts her bikini bottoms to reveal her smooth, sexy ass. He spits on her asshole, rubbing the saliva in with his thumb before plunging his cock into her. She gasps, her ass stretching to accommodate his size. He pounds her hard, his balls slapping against her pussy, until he can't hold back any longer. He pulls out, his cock glistening with their combined juices, and cums all over her ass, the thick load dripping down her crack.